feat: bot.isRunning()

[KnorpelSenf]

Adds a way to inspect whether or not the bot is currently running.

[KnightNiwrem]

Interesting... so this never worked before:

// Some transformer to always throw 401 error on getUpdates

try {
  await bot.start();
} catch {}

console.log('abc');
console.log(bot.pollingRunning);

try {
  await bot.start();
} catch {}

grammy:bot Initializing bot +0ms
grammy:core Calling getMe +0ms
grammy:core Calling deleteWebhook +9ms
grammy:bot I am he_exp_bot! +605ms
grammy:bot Starting simple long polling +2ms
grammy:error msg (401: abc) +0ms
abc
true
grammy:bot Simple long polling already running! +3ms

[KnorpelSenf]

Correct. That was a bug.